Abstract
Magnetorheological (MR) fluids can vary the rheological characteristics according to applied magnetic field strength and have been applied to various kinds of devices such as dampers, cluches, etc. In this paper, typical characteristics of MR fluids were measured under two types of working modes, shear mode and pressure mode, which typically appear in MR devices. Shear stress in shear mode and pressure difference in pressure mode were measured on changing flow rate, magnetic flux density, types of MR fluids and gap through which MR fluids flowed in MR devices. Using the experimental result, the force generated by MR devices was modeled to each mode. As a result, it was shown that MR devices could be designed in respect of the gap and magnetomotive force of the magnetic coil in the devices on the condition that the maximum controllable force of MR devices was given.
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